Heating pad



FIG. 1 is a left front perspective of a heating pad, showing my new design;

FIG. 2 is a front elevational view, thereof, the rear elevational view being substantially a mirror image, thereof;

FIG. 3 is an end elevational view, thereof, the opposite end elevational view being identical thereto;

FIG. 4 is a top plan view, thereof; and,

FIG. 5 is a bottom plan view, thereof. 

The ornamental design for a heating pad, as shown. 